Year	Percent
1950	8.29474
1955	7.48279
1960	8.08163
1965	8.76205
1970	8.62409
1975	7.61043
1980	7.34742
1985	6.85606
1990	7.09025
1995	7.10678
2000	6.34611
2005	4.82807
2010	4.06173
2015	4.29118
2020	4.77668
2025	4.89015
2030	4.99749
2035	4.77673
2040	4.45224
2045	4.40256
2050	4.64582
2055	4.92047
2060	5.0465
2065	4.98353
2070	4.82416
2075	4.74468
2080	4.82855
2085	4.98799
2090	5.07942
2095	5.03198
2100	4.90775