Year	Percent
1950	19.42541
1955	15.65185
1960	16.88025
1965	18.56364
1970	19.05902
1975	19.27348
1980	18.82758
1985	17.1226
1990	18.01086
1995	15.71567
2000	14.16801
2005	13.01929
2010	11.56478
2015	10.79608
2020	10.08941
2025	9.44011
2030	8.77109
2035	8.09189
2040	7.48373
2045	7.00401
2050	6.64978
2055	6.37614
2060	6.14451
2065	5.92488
2070	5.7379
2075	5.57868
2080	5.47705
2085	5.40308
2090	5.34402
2095	5.2869
2100	5.23216