Year	Percent
1950	29.58648
1955	28.74511
1960	28.28938
1965	27.92223
1970	27.3366
1975	27.7411
1980	27.89181
1985	27.73657
1990	27.98073
1995	27.77698
2000	28.51612
2005	30.28758
2010	31.81906
2015	33.0722
2020	33.52991
2025	32.8669
2030	32.25005
2035	31.59947
2040	30.92247
2045	30.23724
2050	29.41391
2055	28.63635
2060	27.84405
2065	27.12029
2070	26.4365
2075	25.79518
2080	25.18702
2085	24.6144
2090	24.11369
2095	23.67939
2100	23.3171