Year	Percent
1950	10.25627
1955	9.32695
1960	11.74257
1965	11.47269
1970	12.05917
1975	12.0987
1980	12.02245
1985	11.47231
1990	11.57602
1995	12.26963
2000	12.66741
2005	10.93402
2010	9.72571
2015	9.49407
2020	9.48317
2025	11.00218
2030	9.99879
2035	9.03836
2040	8.46726
2045	8.39937
2050	8.42909
2055	8.15618
2060	7.7409
2065	7.33407
2070	7.03767
2075	6.85063
2080	6.65718
2085	6.42453
2090	6.17113
2095	5.94717
2100	5.77204