Year	Percent
1950	9.43707
1955	11.37733
1960	9.93314
1965	9.6028
1970	9.63925
1975	9.03121
1980	7.67119
1985	6.32883
1990	6.13346
1995	6.36327
2000	6.46757
2005	6.24501
2010	6.22969
2015	5.71169
2020	5.36032
2025	5.3655
2030	5.39684
2035	5.36053
2040	5.26641
2045	5.13801
2050	5.0375
2055	5.03471
2060	5.10341
2065	5.13714
2070	5.10778
2075	5.02893
2080	4.95527
2085	4.92473
2090	4.9352
2095	4.94571
2100	4.93027