Year	Percent
1950	19.9147
1955	20.77936
1960	19.58073
1965	17.49751
1970	16.71253
1975	18.80936
1980	17.81491
1985	14.97234
1990	14.47688
1995	17.63824
2000	24.39408
2005	29.67479
2010	33.53611
2015	33.80611
2020	31.37279
2025	30.51771
2030	31.58012
2035	30.64326
2040	29.60579
2045	25.36997
2050	20.85797
2055	19.41908
2060	20.20672
2065	22.01311
2070	23.15612
2075	23.0134
2080	22.12195
2085	21.46206
2090	21.35361
2095	21.66392
2100	21.97976