Year	Percent
1950	12.43043
1955	11.32005
1960	15.32016
1965	13.42395
1970	14.15351
1975	15.91672
1980	15.49812
1985	15.37385
1990	15.12936
1995	14.67192
2000	14.10647
2005	14.0862
2010	13.63444
2015	13.47727
2020	13.44371
2025	12.89566
2030	12.35504
2035	11.90967
2040	11.52756
2045	11.17454
2050	10.81487
2055	10.42968
2060	10.04714
2065	9.66237
2070	9.33434
2075	8.99465
2080	8.66696
2085	8.33152
2090	8.00692
2095	7.68995
2100	7.38217