Year	Percent
1950	13.63522
1955	14.87841
1960	15.80357
1965	15.68155
1970	15.76858
1975	15.37279
1980	13.19193
1985	12.93908
1990	12.65382
1995	11.81343
2000	11.01318
2005	9.83397
2010	9.21342
2015	8.39388
2020	7.68563
2025	7.14466
2030	6.64253
2035	6.2529
2040	5.94149
2045	5.69361
2050	5.4994
2055	5.33259
2060	5.19634
2065	5.08306
2070	4.99753
2075	4.93607
2080	4.89809
2085	4.86632
2090	4.84745
2095	4.83216
2100	4.82318