Year	Percent
1950	10.10571
1955	9.94238
1960	8.88864
1965	8.00133
1970	7.09638
1975	7.24296
1980	7.049
1985	6.84591
1990	6.13708
1995	5.26486
2000	5.47642
2005	4.70834
2010	5.05389
2015	4.83886
2020	4.52438
2025	4.31411
2030	4.21954
2035	4.18749
2040	4.24092
2045	4.31263
2050	4.29798
2055	4.22229
2060	4.18182
2065	4.20655
2070	4.27924
2075	4.36536
2080	4.41896
2085	4.41845
2090	4.39665
2095	4.39455
2100	4.42363