Year	Percent
1950	29.60988
1955	27.71745
1960	26.14961
1965	24.3394
1970	21.18925
1975	24.2151
1980	26.8948
1985	31.01433
1990	32.49304
1995	34.46821
2000	33.63351
2005	36.33657
2010	35.4823
2015	31.76544
2020	28.56028
2025	25.5887
2030	24.57095
2035	25.50114
2040	27.03067
2045	27.90017
2050	27.40728
2055	25.874
2060	25.06199
2065	25.13562
2070	25.34906
2075	25.09905
2080	24.35587
2085	23.44621
2090	22.80583
2095	22.559
2100	22.53369