Year	Percent
1950	16.76229
1955	15.17026
1960	17.90595
1965	17.20447
1970	19.13947
1975	18.98382
1980	19.54435
1985	19.71545
1990	19.09538
1995	18.91443
2000	18.87893
2005	18.80281
2010	18.34555
2015	17.79808
2020	16.89789
2025	15.95723
2030	15.04142
2035	14.15548
2040	13.26665
2045	12.36277
2050	11.49572
2055	10.7165
2060	10.04424
2065	9.45227
2070	8.9304
2075	8.44553
2080	8.0031
2085	7.61341
2090	7.28866
2095	6.99457
2100	6.76158