Year	Percent
1950	12.27425
1955	11.76088
1960	11.64646
1965	12.49691
1970	12.8172
1975	12.86341
1980	12.62223
1985	12.70623
1990	12.45785
1995	11.42153
2000	11.18176
2005	11.86821
2010	11.5224
2015	9.76897
2020	8.88373
2025	8.36937
2030	8.15544
2035	7.71133
2040	7.14914
2045	6.58423
2050	6.11349
2055	5.79153
2060	5.57382
2065	5.37137
2070	5.15422
2075	4.93857
2080	4.77801
2085	4.68122
2090	4.6388
2095	4.61127
2100	4.57979