Year	Percent
1950	28.01818
1955	28.92655
1960	29.12873
1965	28.95285
1970	27.89933
1975	26.44808
1980	26.28426
1985	26.76219
1990	27.12637
1995	27.60494
2000	28.23039
2005	29.47552
2010	31.01359
2015	31.97949
2020	32.28031
2025	31.71823
2030	31.28617
2035	31.37446
2040	31.45567
2045	31.55671
2050	30.96796
2055	30.00236
2060	29.26207
2065	28.8271
2070	28.5177
2075	28.07566
2080	27.41883
2085	26.67974
2090	26.03136
2095	25.55127
2100	25.15716