Year	Percent
1950	13.10272
1955	12.50081
1960	14.76675
1965	14.92069
1970	15.14313
1975	14.88663
1980	14.96287
1985	15.03575
1990	14.64941
1995	13.50565
2000	11.73488
2005	9.07659
2010	8.03406
2015	9.52541
2020	10.60362
2025	9.34036
2030	8.10669
2035	7.10642
2040	6.59565
2045	6.52463
2050	6.60653
2055	6.53974
2060	6.17955
2065	5.72088
2070	5.42395
2075	5.33771
2080	5.36754
2085	5.37246
2090	5.27267
2095	5.09478
2100	4.93367