Year	Percent
1950	11.82548
1955	12.82459
1960	14.81578
1965	16.19126
1970	15.58495
1975	15.61834
1980	15.63872
1985	14.2256
1990	14.69459
1995	14.02328
2000	13.75533
2005	13.44867
2010	12.20741
2015	10.5428
2020	9.92998
2025	9.62653
2030	9.16476
2035	8.53091
2040	7.8918
2045	7.37729
2050	7.00803
2055	6.7336
2060	6.47304
2065	6.21881
2070	5.97582
2075	5.78291
2080	5.64501
2085	5.54237
2090	5.45871
2095	5.37073
2100	5.28175