Year	Percent
1950	11.47636
1955	14.86285
1960	15.62367
1965	15.53723
1970	15.46116
1975	14.00945
1980	12.90892
1985	11.97653
1990	11.33115
1995	10.17958
2000	8.77219
2005	8.58668
2010	8.2825
2015	8.05312
2020	7.20767
2025	6.24433
2030	5.75752
2035	5.6694
2040	5.74131
2045	5.724
2050	5.51568
2055	5.23238
2060	5.04331
2065	5.01874
2070	5.07872
2075	5.0997
2080	5.01582
2085	4.86505
2090	4.72621
2095	4.66571
2100	4.66205