Year	Percent
1950	29.05847
1955	30.62603
1960	33.28504
1965	31.72571
1970	32.43905
1975	30.35945
1980	30.17461
1985	27.77027
1990	29.83056
1995	28.18538
2000	28.36755
2005	28.4831
2010	28.12766
2015	28.32786
2020	28.58906
2025	29.25444
2030	30.25907
2035	31.32785
2040	32.09757
2045	32.58294
2050	32.84831
2055	32.88737
2060	32.77353
2065	32.47247
2070	31.97836
2075	31.34126
2080	30.65102
2085	29.98742
2090	29.39077
2095	28.84795
2100	28.32036