Year	Percent
1950	11.23998
1955	10.97839
1960	11.52433
1965	12.75218
1970	12.85924
1975	12.82152
1980	13.00277
1985	12.87089
1990	13.03526
1995	12.87565
2000	12.47756
2005	12.27456
2010	11.75197
2015	11.06008
2020	9.92315
2025	8.82676
2030	8.40243
2035	7.9701
2040	7.48359
2045	6.96011
2050	6.48573
2055	6.10069
2060	5.79222
2065	5.55822
2070	5.36281
2075	5.20601
2080	5.05346
2085	4.94128
2090	4.86017
2095	4.81074
2100	4.77433