Year	Percent
1950	10.3015
1955	8.46982
1960	9.09547
1965	8.42852
1970	8.6754
1975	8.21298
1980	8.10465
1985	7.46114
1990	7.43394
1995	6.69119
2000	5.45617
2005	5.15899
2010	4.98033
2015	4.89574
2020	5.22315
2025	4.62593
2030	4.10968
2035	3.82951
2040	3.8471
2045	3.99249
2050	4.17069
2055	4.24296
2060	4.17221
2065	4.07906
2070	4.08887
2075	4.21475
2080	4.38098
2085	4.49606
2090	4.51671
2095	4.46984
2100	4.42752