Year	Percent
1950	17.38152
1955	19.49589
1960	19.88203
1965	20.13284
1970	20.28402
1975	20.65258
1980	20.5744
1985	20.19628
1990	19.00531
1995	17.05768
2000	17.242
2005	16.86552
2010	16.27349
2015	14.81329
2020	13.88158
2025	13.09704
2030	12.41771
2035	11.73378
2040	11.02226
2045	10.33631
2050	9.73555
2055	9.18586
2060	8.68205
2065	8.21388
2070	7.77165
2075	7.34644
2080	6.97218
2085	6.65641
2090	6.3749
2095	6.12997
2100	5.91062