month-year TAI TII Jan-48 -79.38 157.75 Feb-48 -60 84.9 Mar-48 -999 -999 Dec-48 -63.13 52.4 Jan-49 -999 -999 Feb-49 -96.88 42.2 Mar-49 -73.75 103.8 Dec-49 -93.75 59.5 Jan-50 -999 -999 Feb-50 -68.13 117.45 Mar-50 -68.13 89.2 Dec-50 -82.5 238.3 Jan-51 -86.25 103.4 Feb-51 -76.25 97.8 Mar-51 -84.38 54.2 Dec-51 -89.38 95.05 Jan-52 -999 -999 Feb-52 -70 143.85 Mar-52 -57.5 44.25 Dec-52 -68.75 92.2 Jan-53 -81.88 123.1 Feb-53 -76.25 110 Mar-53 -68.13 84.25 Dec-53 -84.38 145.6 Jan-54 -72.5 130.8 Feb-54 -78.75 187.6 Mar-54 -74.38 101.6 Dec-54 -74.38 209.5 Jan-55 -65 136.25 Feb-55 -93.13 75.2 Mar-55 -67.5 62.1 Dec-55 -61.25 189.7 Jan-56 -70 127.55 Feb-56 -69.38 101.2 Mar-56 -70.63 120.95 Dec-56 -76.88 110.25 Jan-57 -69.38 123.9 Feb-57 -56.88 47.95 Mar-57 -53.13 71.65 Dec-57 -84.38 152.45 Jan-58 -78.13 159.05 Feb-58 -71.25 196.65 Mar-58 -51.25 105.05 Dec-58 -70 186.1 Jan-59 -68.75 119.7 Feb-59 -60 151.65 Mar-59 -70 84.1 Dec-59 -73.13 117.2 Jan-60 -56.25 152.35 Feb-60 -78.75 51.75 Mar-60 -64.38 147.25 Dec-60 -75.63 221.4 Jan-61 -68.75 228.85 Feb-61 -51.88 170.3 Mar-61 -56.25 163 Dec-61 -48.13 97.7 Jan-62 -78.75 161.95 Feb-62 -74.38 118.05 Mar-62 -52.5 159.75 Dec-62 -74.38 175.35 Jan-63 -85.63 177.25 Feb-63 -75.63 211.2 Mar-63 -50.63 105.65 Dec-63 -72.5 206.6 Jan-64 -70.63 48.55 Feb-64 -66.88 102.7 Mar-64 -85.63 46.2 Dec-64 -89.38 64.35 Jan-65 -73.13 154.1 Feb-65 -75.63 79.55 Mar-65 -55.63 140.9 Dec-65 -64.38 141.75 Jan-66 -50.63 94.75 Feb-66 -40.63 104.35 Mar-66 -76.25 87.55 Dec-66 -83.13 106.95 Jan-67 -83.75 105.25 Feb-67 -77.5 173.35 Mar-67 -63.75 167 Dec-67 -97.5 100.95 Jan-68 -63.13 116.2 Feb-68 -73.13 249.7 Mar-68 -68.13 115.25 Dec-68 -73.13 99.9 Jan-69 -999 -999 Feb-69 -69.38 123.25 Mar-69 -71.88 109.65 Dec-69 -75 218.15 Jan-70 -65 101.1 Feb-70 -78.75 223.5 Mar-70 -71.88 93.95 Dec-70 -61.88 159.1 Jan-71 -71.88 128.35 Feb-71 -86.25 123.1 Mar-71 -73.13 176.9 Dec-71 -72.5 144.8 Jan-72 -88.13 140.9 Feb-72 -73.75 151.75 Mar-72 -76.88 153.8 Dec-72 -85.63 54.65 Jan-73 -63.13 106.6 Feb-73 -73.75 186.25 Mar-73 -999 -999 Dec-73 -87.5 134.6 Jan-74 -999 -999 Feb-74 -72.5 151.55 Mar-74 -63.13 100.85 Dec-74 -73.75 62.55 Jan-75 -88.75 118.75 Feb-75 -999 -999 Mar-75 -72.5 77.2 Dec-75 -80 120.85 Jan-76 -81.25 197.1 Feb-76 -71.25 112.15 Mar-76 -93.13 47.75 Dec-76 -78.13 229.8 Jan-77 -74.38 244.45 Feb-77 -74.38 146.95 Mar-77 -58.13 76.35 Dec-77 -84.38 154.3 Jan-78 -76.25 220.3 Feb-78 -68.75 129.05 Mar-78 -70 147.35 Dec-78 -70.63 22.45 Jan-79 -88.13 129.25 Feb-79 -52.5 157.4 Mar-79 -73.13 77.85 Dec-79 -65 128.3 Jan-80 -66.25 93 Feb-80 -68.13 184.65 Mar-80 -64.38 104.4 Dec-80 -70.63 200.65 Jan-81 -71.25 325.35 Feb-81 -87.5 153.05 Mar-81 -55.63 118.25 Dec-81 -83.13 140.45 Jan-82 -76.88 125.7 Feb-82 -65 54 Mar-82 -999 -999 Dec-82 -92.5 74.95 Jan-83 -76.88 152.4 Feb-83 -65.63 102.1 Mar-83 -74.38 85.15 Dec-83 -88.13 137.2 Jan-84 -81.25 212.3 Feb-84 -84.38 105.85 Mar-84 -73.13 149.95 Dec-84 -98.13 61.75 Jan-85 -66.25 182.8 Feb-85 -85 89.1 Mar-85 -59.38 154.2 Dec-85 -80.63 206.6 Jan-86 -75.63 246.95 Feb-86 -63.13 87.5 Mar-86 -73.75 129.1 Dec-86 -71.88 58.1 Jan-87 -67.5 113.15 Feb-87 -58.13 237.8 Mar-87 -61.88 102.65 Dec-87 -56.88 110.15 Jan-88 -84.38 155.8 Feb-88 -82.5 230.4 Mar-88 -63.75 113.2 Dec-88 -70.63 150.5 Jan-89 -64.38 99.6 Feb-89 -81.25 131.85 Mar-89 -75.63 39.15 Dec-89 -66.25 116 Jan-90 -81.25 88.15 Feb-90 -65 87.35 Mar-90 -71.88 65.85 Dec-90 -96.25 108.95 Jan-91 -80 105.55 Feb-91 -71.25 145.75 Mar-91 -999 -999 Dec-91 -65.63 115.05 Jan-92 -65.63 129.6 Feb-92 -68.13 163.9 Mar-92 -69.38 192.3 Dec-92 -68.75 73.15 Jan-93 -999 -999 Feb-93 -70.63 211.75 Mar-93 -71.88 111.95 Dec-93 -78.13 167 Jan-94 -78.75 211.4 Feb-94 -72.5 59.35 Mar-94 -73.75 152.9 Dec-94 -999 -999 Jan-95 -75 107.6 Feb-95 -73.13 222.55 Mar-95 -62.5 132.95 Dec-95 -59.38 138.25 Jan-96 -84.38 129.15 Feb-96 -75.63 231.1 Mar-96 -73.75 115.3 Dec-96 -90 141.25 Jan-97 -74.38 122.95 Feb-97 -75.63 65.5 Mar-97 -61.25 156.85 Dec-97 -65.63 99.9 Jan-98 -80 57.6 Feb-98 -999 -999 Mar-98 -77.5 100.8 Dec-98 -80.63 56.4