Year	Percent
1950	7.77912
1955	7.71924
1960	7.87416
1965	7.6174
1970	6.7685
1975	7.23578
1980	6.82216
1985	7.48127
1990	7.69961
1995	5.69777
2000	4.05211
2005	4.47228
2010	5.31029
2015	5.05911
2020	4.93953
2025	4.7331
2030	4.40118
2035	4.30836
2040	4.60969
2045	4.94973
2050	5.03467
2055	4.91262
2060	4.74314
2065	4.66483
2070	4.75895
2075	4.94448
2080	5.07041
2085	5.04271
2090	4.90908
2095	4.79206
2100	4.76575