Year	Percent
1950	11.23988
1955	10.80652
1960	10.21552
1965	11.60618
1970	12.38361
1975	12.49174
1980	12.33152
1985	12.18252
1990	12.40033
1995	13.02961
2000	13.09027
2005	12.54964
2010	12.05582
2015	11.74507
2020	11.6926
2025	11.64556
2030	11.19569
2035	10.69952
2040	10.2603
2045	9.91778
2050	9.6325
2055	9.34818
2060	9.0416
2065	8.70559
2070	8.40055
2075	8.12345
2080	7.89298
2085	7.64546
2090	7.39479
2095	7.15316
2100	6.92564