Year	Percent
1950	9.62836
1955	10.54941
1960	13.62884
1965	15.35157
1970	15.89785
1975	14.6352
1980	13.91269
1985	13.86547
1990	13.46692
1995	14.06215
2000	13.23263
2005	10.34261
2010	9.97945
2015	9.74651
2020	11.46984
2025	10.49429
2030	9.31731
2035	8.39686
2040	8.07327
2045	8.1442
2050	8.12915
2055	7.80901
2060	7.30348
2065	6.89559
2070	6.70324
2075	6.65384
2080	6.60917
2085	6.4662
2090	6.24549
2095	6.04342
2100	5.92536