Year	Percent
1950	30.64597
1955	29.85343
1960	34.51896
1965	33.46402
1970	30.64029
1975	31.96722
1980	30.5185
1985	31.7958
1990	31.29843
1995	30.38927
2000	30.37946
2005	31.61942
2010	33.21521
2015	32.55267
2020	29.96395
2025	26.25274
2030	23.89056
2035	23.86892
2040	25.10906
2045	26.20165
2050	25.48023
2055	24.30276
2060	23.56804
2065	23.60408
2070	24.1829
2075	24.69737
2080	24.62393
2085	23.99108
2090	23.28527
2095	22.94293
2100	22.99439