Year	Percent
1950	19.63396
1955	20.16403
1960	20.32745
1965	19.72496
1970	19.1617
1975	19.84117
1980	20.84423
1985	21.29366
1990	19.7826
1995	12.44069
2000	16.73991
2005	16.51366
2010	16.36525
2015	15.25802
2020	13.93934
2025	12.7789
2030	11.98298
2035	11.42643
2040	10.81126
2045	10.03152
2050	9.20718
2055	8.49188
2060	7.93615
2065	7.47843
2070	7.0732
2075	6.66259
2080	6.28779
2085	5.97558
2090	5.74193
2095	5.56559
2100	5.42744