Year	Percent
1950	21.61856
1955	22.23908
1960	22.03362
1965	20.37439
1970	21.40939
1975	22.53398
1980	25.77007
1985	26.25603
1990	24.87005
1995	25.10446
2000	25.78423
2005	27.03092
2010	28.08888
2015	28.89036
2020	28.70933
2025	28.924
2030	30.27938
2035	30.01196
2040	27.66167
2045	25.36737
2050	23.93246
2055	23.83612
2060	25.8191
2065	26.71206
2070	25.64665
2075	24.39036
2080	23.66658
2085	23.64622
2090	24.18913
2095	24.73717
2100	24.69839