Year	Percent
1950	7.28675
1955	9.81332
1960	6.13912
1965	6.62576
1970	8.0928
1975	7.471
1980	6.90509
1985	6.02522
1990	6.48585
1995	6.75017
2000	7.10002
2005	6.65838
2010	5.43269
2015	4.29751
2020	4.01887
2025	5.00959
2030	5.24318
2035	5.14997
2040	4.87145
2045	4.55758
2050	4.45829
2055	4.68987
2060	5.0248
2065	5.18363
2070	5.1216
2075	4.983
2080	4.91766
2085	4.98709
2090	5.12675
2095	5.20403
2100	5.16359