Year	Percent
1950	9.40559
1955	7.74865
1960	7.49665
1965	8.4685
1970	8.02599
1975	7.46272
1980	7.02598
1985	6.86918
1990	7.26669
1995	7.35366
2000	6.77249
2005	6.61876
2010	5.40014
2015	4.24782
2020	4.49933
2025	5.23239
2030	5.13705
2035	5.1496
2040	5.04722
2045	4.82789
2050	4.73179
2055	4.93989
2060	5.20617
2065	5.30951
2070	5.27153
2075	5.16775
2080	5.09291
2085	5.11472
2090	5.197
2095	5.24708
2100	5.21291