Year	Percent
1950	9.56106
1955	9.01778
1960	15.7402
1965	15.2717
1970	16.85172
1975	15.88375
1980	14.99841
1985	14.43874
1990	15.31167
1995	15.7473
2000	14.55391
2005	12.63868
2010	11.23145
2015	10.3728
2020	9.56362
2025	9.10819
2030	8.49526
2035	7.80264
2040	7.17237
2045	6.67014
2050	6.28617
2055	5.98591
2060	5.72223
2065	5.49017
2070	5.29281
2075	5.13572
2080	5.02682
2085	4.95836
2090	4.90003
2095	4.85061
2100	4.80446