Year	Percent
1950	18.5718
1955	17.98298
1960	17.35617
1965	15.80349
1970	13.91148
1975	12.66357
1980	11.84615
1985	11.65487
1990	11.10779
1995	11.48888
2000	11.09019
2005	11.03704
2010	12.16964
2015	13.21787
2020	14.70762
2025	15.87759
2030	16.50915
2035	16.96458
2040	17.44075
2045	17.86424
2050	18.46871
2055	19.27395
2060	19.99244
2065	20.69908
2070	21.25734
2075	21.68463
2080	22.14082
2085	22.62251
2090	23.07444
2095	23.46177
2100	23.76923