Year	Percent
1950	8.83259
1955	9.59265
1960	8.16835
1965	6.23782
1970	6.87102
1975	7.39043
1980	8.15329
1985	6.07315
1990	5.92105
1995	5.77383
2000	4.83368
2005	4.72041
2010	4.86016
2015	4.56797
2020	4.53444
2025	4.4981
2030	4.45696
2035	4.3652
2040	4.33817
2045	4.37437
2050	4.40051
2055	4.42832
2060	4.46298
2065	4.48814
2070	4.50757
2075	4.53119
2080	4.5605
2085	4.58731
2090	4.60246
2095	4.60059
2100	4.58982