Year	Percent
1950	21.68419
1955	21.5752
1960	21.70115
1965	20.0615
1970	18.45585
1975	17.56671
1980	16.66571
1985	17.00999
1990	17.53473
1995	19.70595
2000	20.47684
2005	20.29238
2010	20.18628
2015	21.00584
2020	21.35145
2025	20.59039
2030	19.57459
2035	19.25091
2040	19.73638
2045	21.03966
2050	22.50483
2055	23.26027
2060	23.39583
2065	23.2619
2070	23.10613
2075	23.16484
2080	23.39641
2085	23.58482
2090	23.60689
2095	23.48651
2100	23.32169