Year	Percent
1950	7.40597
1955	7.7272
1960	8.00038
1965	7.6522
1970	7.2223
1975	7.93015
1980	7.55082
1985	6.21732
1990	5.40205
1995	5.61499
2000	6.19799
2005	5.86932
2010	5.53355
2015	4.93675
2020	5.03661
2025	4.8608
2030	4.73959
2035	4.68748
2040	4.66311
2045	4.64584
2050	4.62677
2055	4.61974
2060	4.63476
2065	4.65372
2070	4.67809
2075	4.69371
2080	4.6939
2085	4.68123
2090	4.67046
2095	4.6536
2100	4.63992