Year	Percent
1950	6.36218
1955	9.20669
1960	8.69723
1965	8.36305
1970	8.4121
1975	7.91288
1980	7.60604
1985	6.60921
1990	6.73005
1995	6.55624
2000	6.13692
2005	6.10802
2010	6.16591
2015	6.17122
2020	5.91792
2025	5.71031
2030	5.58807
2035	5.55664
2040	5.59181
2045	5.60219
2050	5.54793
2055	5.46373
2060	5.40444
2065	5.38805
2070	5.39308
2075	5.37807
2080	5.33176
2085	5.26381
2090	5.19604
2095	5.15347
2100	5.12386