Year	Percent
1950	13.69357
1955	14.73949
1960	15.76771
1965	16.8046
1970	17.45538
1975	17.85698
1980	18.3071
1985	18.51438
1990	18.48807
1995	18.16963
2000	17.77703
2005	17.24532
2010	16.94496
2015	16.44335
2020	15.73826
2025	15.09219
2030	14.4604
2035	13.83431
2040	13.22709
2045	12.6196
2050	12.03522
2055	11.50093
2060	10.99696
2065	10.54298
2070	10.08948
2075	9.67116
2080	9.27344
2085	8.91137
2090	8.55798
2095	8.21663
2100	7.90258