Year	Percent
1950	13.81871
1955	12.38798
1960	12.7901
1965	12.79438
1970	11.65065
1975	12.39505
1980	11.47053
1985	9.55262
1990	9.81534
1995	8.09464
2000	9.20697
2005	7.3335
2010	6.7198
2015	7.00915
2020	6.63183
2025	6.16298
2030	5.87306
2035	5.77987
2040	5.71713
2045	5.56226
2050	5.3671
2055	5.1383
2060	4.97795
2065	4.85662
2070	4.73446
2075	4.58732
2080	4.42631
2085	4.27535
2090	4.15512
2095	4.08315
2100	4.03995