Year	Percent
1950	9.13415
1955	8.70848
1960	8.2986
1965	9.95927
1970	9.17561
1975	8.93887
1980	8.56322
1985	7.95572
1990	7.28381
1995	7.33544
2000	7.88628
2005	7.53768
2010	7.56059
2015	6.53188
2020	5.8727
2025	5.73522
2030	5.55958
2035	5.2068
2040	4.80608
2045	4.63124
2050	4.59553
2055	4.61898
2060	4.61583
2065	4.56031
2070	4.50063
2075	4.47551
2080	4.51326
2085	4.57324
2090	4.61433
2095	4.62387
2100	4.61016