Year	Percent
1950	11.28821
1955	10.84208
1960	10.36091
1965	10.91391
1970	11.67055
1975	12.52834
1980	11.88162
1985	12.48518
1990	16.59544
1995	17.73518
2000	19.21999
2005	18.56053
2010	19.0755
2015	20.40342
2020	22.70883
2025	24.71249
2030	25.73018
2035	26.83534
2040	27.98309
2045	29.64942
2050	31.43753
2055	31.79859
2060	30.83606
2065	29.86739
2070	29.74412
2075	30.41482
2080	31.01134
2085	31.41888
2090	31.55752
2095	31.64572
2100	31.96148