Year	Percent
1950	15.78507
1955	16.51033
1960	17.67105
1965	15.32245
1970	16.29985
1975	14.95082
1980	16.29482
1985	18.91565
1990	23.73226
1995	25.59168
2000	27.50614
2005	28.02864
2010	28.25984
2015	27.16126
2020	24.4095
2025	21.59199
2030	18.90638
2035	19.02862
2040	20.24205
2045	22.21899
2050	24.89561
2055	25.59807
2060	25.55237
2065	25.14801
2070	24.40075
2075	23.5387
2080	23.05437
2085	22.72495
2090	22.25338
2095	21.66135
2100	21.14322