Year	Percent
1950	8.36415
1955	7.91505
1960	7.49863
1965	7.31249
1970	7.17262
1975	5.75406
1980	5.28656
1985	5.37711
1990	5.73181
1995	5.74261
2000	5.51286
2005	5.3074
2010	5.00686
2015	4.81503
2020	4.67543
2025	4.60369
2030	4.55438
2035	4.5122
2040	4.47121
2045	4.44843
2050	4.45265
2055	4.47606
2060	4.5078
2065	4.53349
2070	4.53718
2075	4.5295
2080	4.51709
2085	4.50314
2090	4.48857
2095	4.47133
2100	4.43943