Year	Percent
1950	13.95243
1955	14.26703
1960	14.5391
1965	14.70462
1970	14.97461
1975	15.27134
1980	15.42633
1985	15.39217
1990	14.97509
1995	14.28405
2000	14.50318
2005	14.39378
2010	14.36114
2015	13.82061
2020	13.17588
2025	12.61146
2030	12.18198
2035	11.82727
2040	11.42997
2045	10.96455
2050	10.48255
2055	10.04433
2060	9.66793
2065	9.34228
2070	9.04411
2075	8.73145
2080	8.41054
2085	8.1032
2090	7.8295
2095	7.58649
2100	7.33351