Year	Percent
1950	17.47173
1955	18.79119
1960	19.44588
1965	19.24538
1970	18.86732
1975	18.57926
1980	18.20806
1985	17.95187
1990	17.74475
1995	17.36217
2000	16.77817
2005	16.28899
2010	15.88991
2015	15.47332
2020	14.70045
2025	13.95434
2030	13.29164
2035	12.7284
2040	12.2382
2045	11.76727
2050	11.30503
2055	10.85347
2060	10.43435
2065	10.05063
2070	9.69437
2075	9.35879
2080	9.04918
2085	8.75765
2090	8.44962
2095	8.18024
2100	7.91641