Year	Percent
1950	30.11921
1955	29.5231
1960	27.7742
1965	25.75042
1970	25.81368
1975	25.60713
1980	26.4261
1985	27.45732
1990	27.5746
1995	27.92195
2000	29.11556
2005	31.08328
2010	33.05203
2015	32.47773
2020	30.72154
2025	29.16372
2030	28.02426
2035	29.38481
2040	30.40555
2045	30.54534
2050	30.22443
2055	28.91388
2060	28.46079
2065	28.44264
2070	28.39697
2075	27.94885
2080	27.14838
2085	26.37607
2090	25.7598
2095	25.26767
2100	24.7899