Year	Percent
1950	12.99523
1955	12.13432
1960	14.02133
1965	13.73161
1970	13.48721
1975	13.53972
1980	13.70545
1985	14.10049
1990	14.42508
1995	13.9248
2000	14.20322
2005	14.25562
2010	13.35456
2015	11.59048
2020	9.72258
2025	9.17962
2030	8.63796
2035	7.9406
2040	7.13737
2045	6.46998
2050	6.04133
2055	5.72202
2060	5.43816
2065	5.16042
2070	4.91203
2075	4.72294
2080	4.59697
2085	4.53012
2090	4.48937
2095	4.45688
2100	4.42586