Year	Percent
1950	13.16709
1955	14.25092
1960	13.96684
1965	13.06802
1970	11.12819
1975	10.21872
1980	9.38368
1985	9.25745
1990	8.73572
1995	7.78998
2000	7.1047
2005	6.89172
2010	6.72111
2015	6.19955
2020	5.77667
2025	5.47189
2030	5.27501
2035	5.1248
2040	5.02556
2045	4.92679
2050	4.81647
2055	4.70928
2060	4.62776
2065	4.5824
2070	4.56031
2075	4.54622
2080	4.53126
2085	4.51787
2090	4.51195
2095	4.51852
2100	4.52776