Year	Percent
1950	12.65759
1955	11.44935
1960	12.63185
1965	12.50539
1970	12.15041
1975	10.34358
1980	9.68581
1985	8.79516
1990	9.10997
1995	8.15157
2000	7.44688
2005	6.95677
2010	6.66552
2015	6.62107
2020	6.15492
2025	5.76013
2030	5.47429
2035	5.29774
2040	5.1666
2045	5.08219
2050	4.99103
2055	4.88393
2060	4.78023
2065	4.70693
2070	4.67372
2075	4.66421
2080	4.65893
2085	4.64976
2090	4.63738
2095	4.63094
2100	4.63325