Year	Percent
1950	9.15266
1955	9.24794
1960	8.95468
1965	9.21083
1970	9.25797
1975	8.56477
1980	8.7938
1985	8.9193
1990	7.94759
1995	7.89204
2000	7.95958
2005	7.52209
2010	7.05251
2015	6.73124
2020	6.49545
2025	6.29341
2030	6.10836
2035	5.90069
2040	5.67035
2045	5.46349
2050	5.30729
2055	5.1894
2060	5.08472
2065	4.98749
2070	4.89712
2075	4.81737
2080	4.75223
2085	4.71062
2090	4.67885
2095	4.64493
2100	4.61993