Year	years
1960	66.57016776222942
1961	66.9592447748992
1962	66.87021838000247
1963	66.98324562080218
1964	67.4726981196551
1965	67.53731715057862
1966	67.75271939692372
1967	67.89512025347926
1968	67.78262049755668
1969	67.62541457932043
1970	68.03769923015858
1971	68.14090511256697
1972	68.46411839811331
1973	68.56230436220966
1974	68.8485834373978
1975	68.87207909748507
1976	69.17242302442868
1977	69.56145694759162
1978	69.69214538469753
1979	70.01251607972256
1980	70.14856660402364
1981	70.4280662673549
1982	70.77869623528682
1983	70.85328060983962
1984	71.22262810438664
1985	71.38399759408028
1986	71.71140798121475
1987	71.9959442317097
1988	72.17307268254956
1989	72.33144350212163
1990	72.39895201167558
1991	72.50580102772174
1992	72.82788773242193
1993	72.98017939323084
1994	73.29211484753999
1995	73.4634340571937
1996	73.78164684294691
1997	74.20886591238104
1998	74.46695945372441
1999	74.72508006774893
2000	75.01058054259664
2001	75.4016901960049
2002	75.54717213498893
2003	75.66069372290019
2004	76.21934310596421
2005	76.39524987123487
2006	76.82673219896715
2007	77.11041391070324
2008	77.39404427004055
2009	77.61608443997441
2010	77.88270185492324
2011	78.35600721558366
2012	78.43471065625961
2013	78.7661996250649
2014	79.21439997478984
2015	78.93530335201895
2016	79.30851946924341
2017	79.38156820789267
2018	79.49826707182481
2019	79.80002368383745
2020	78.9616299402231
2021	79.0283508526873
2022	79.25775187578864