Year	Percent
1950	13.07032
1955	12.95745
1960	11.98762
1965	11.69106
1970	12.16116
1975	12.17976
1980	12.35464
1985	10.96416
1990	12.28454
1995	12.93361
2000	13.96955
2005	16.74548
2010	17.79295
2015	18.82652
2020	19.89232
2025	21.96146
2030	26.23976
2035	28.20953
2040	28.90711
2045	27.32251
2050	25.38284
2055	25.43658
2060	26.22649
2065	27.09692
2070	26.61427
2075	25.22255
2080	23.93231
2085	23.43526
2090	23.62708
2095	23.82656
2100	23.46622