Year	Percent
1950	17.9376
1955	18.67433
1960	16.80936
1965	13.81178
1970	11.77631
1975	11.67974
1980	11.30869
1985	10.24863
1990	8.50051
1995	8.49168
2000	8.57681
2005	11.12738
2010	15.05759
2015	16.48685
2020	18.08397
2025	20.30558
2030	23.26476
2035	25.95314
2040	27.83848
2045	28.19539
2050	27.78506
2055	27.27092
2060	27.00118
2065	26.97279
2070	26.86583
2075	26.62916
2080	26.09403
2085	25.47709
2090	24.95417
2095	24.56052
2100	24.25491