Year	Percent
1950	9.5398
1955	8.8368
1960	9.45962
1965	8.93324
1970	9.30471
1975	9.26492
1980	8.72488
1985	8.54406
1990	8.02413
1995	6.77357
2000	5.67602
2005	5.14817
2010	5.30605
2015	5.09878
2020	4.81744
2025	4.40291
2030	3.93665
2035	3.73784
2040	3.82746
2045	3.97263
2050	4.06222
2055	4.05301
2060	3.98231
2065	3.93504
2070	4.00055
2075	4.1443
2080	4.28655
2085	4.35237
2090	4.348
2095	4.317
2100	4.31632