Year	Percent
1950	27.75292
1955	27.69834
1960	27.48323
1965	27.19149
1970	26.7801
1975	26.30654
1980	25.92935
1985	25.88505
1990	26.09672
1995	26.44389
2000	28.51731
2005	29.53757
2010	29.96424
2015	29.74506
2020	29.50193
2025	29.84127
2030	30.49738
2035	31.16069
2040	31.52645
2045	31.43433
2050	31.17916
2055	31.02789
2060	30.9757
2065	30.89412
2070	30.68578
2075	30.40134
2080	30.08657
2085	29.80034
2090	29.54126
2095	29.2546
2100	28.93893