Year Years 1950 66.94281 1955 67.93985 1960 69.37442 1965 69.63214 1970 69.42839 1975 67.96877 1980 69.28345 1985 70.15126 1990 70.94669 1995 70.69762 2000 71.39382 2005 72.59485 2010 74.65743 2015 74.03985 2020 72.10319 2025 71.02434 2030 70.91556 2035 72.32766 2040 74.62965 2045 75.86603 2050 76.13888 2055 76.11359 2060 76.04764 2065 76.35203 2070 76.75751 2075 77.72794 2080 79.49012 2085 81.78097 2090 84.03417 2095 85.80736 2100 87.18797