Year	Percent
1950	6.4906
1955	5.94825
1960	7.3898
1965	7.23393
1970	7.58722
1975	7.77615
1980	7.05206
1985	6.33484
1990	5.76167
1995	5.6547
2000	5.68317
2005	5.74852
2010	5.37534
2015	5.29655
2020	5.56093
2025	5.5174
2030	5.51793
2035	5.39247
2040	5.23722
2045	5.14976
2050	5.1886
2055	5.26667
2060	5.30302
2065	5.28247
2070	5.21458
2075	5.15178
2080	5.12502
2085	5.12951
2090	5.12488
2095	5.09615
2100	5.03541