Year	Percent
1950	21.88947
1955	21.47736
1960	21.36344
1965	21.04976
1970	19.605
1975	17.71799
1980	15.33941
1985	13.6742
1990	12.58654
1995	11.29747
2000	10.16712
2005	8.86809
2010	8.47857
2015	7.79705
2020	7.25448
2025	6.71764
2030	6.27726
2035	5.94673
2040	5.71182
2045	5.51931
2050	5.33222
2055	5.14826
2060	4.97803
2065	4.8546
2070	4.76309
2075	4.69544
2080	4.62223
2085	4.54924
2090	4.4774
2095	4.42651
2100	4.39079