Year	Percent
1950	17.56607
1955	16.32365
1960	16.71242
1965	17.48709
1970	19.3941
1975	20.51264
1980	21.81433
1985	22.16612
1990	22.1917
1995	20.22972
2000	17.77109
2005	16.47759
2010	15.74062
2015	15.08695
2020	13.96525
2025	12.77558
2030	11.70496
2035	10.79676
2040	9.98007
2045	9.23981
2050	8.55596
2055	7.89275
2060	7.31353
2065	6.84599
2070	6.46729
2075	6.17297
2080	5.94174
2085	5.75262
2090	5.59834
2095	5.47435
2100	5.37885