Year	Percent
1950	7.85966
1955	9.06626
1960	9.10241
1965	8.85427
1970	7.90578
1975	7.48502
1980	6.97148
1985	7.17913
1990	7.26841
1995	6.14238
2000	4.75979
2005	4.00497
2010	4.2777
2015	4.66811
2020	4.78247
2025	4.87362
2030	4.64127
2035	4.3166
2040	4.26521
2045	4.49801
2050	4.76288
2055	4.8878
2060	4.83248
2065	4.68591
2070	4.61888
2075	4.71076
2080	4.87612
2085	4.97728
2090	4.94447
2095	4.83108
2100	4.73542