Year	Percent
1950	9.25636
1955	8.0921
1960	6.85006
1965	7.15312
1970	7.38317
1975	7.16613
1980	6.42524
1985	7.00939
1990	6.46318
1995	7.32505
2000	7.83147
2005	6.12775
2010	4.16108
2015	4.71259
2020	5.58238
2025	5.4501
2030	5.3001
2035	5.08064
2040	4.7184
2045	4.59763
2050	4.90977
2055	5.27824
2060	5.3778
2065	5.24932
2070	5.05827
2075	4.95274
2080	5.02068
2085	5.17929
2090	5.27787
2095	5.23122
2100	5.0949