Year	Percent
1950	9.29515
1955	8.99217
1960	8.87425
1965	8.69191
1970	9.92708
1975	9.82956
1980	9.86233
1985	9.9572
1990	8.6284
1995	9.26237
2000	10.15655
2005	9.16221
2010	8.50717
2015	8.42291
2020	8.61336
2025	9.50684
2030	9.55179
2035	9.51268
2040	9.51985
2045	9.31661
2050	8.99993
2055	8.69111
2060	8.43256
2065	8.16188
2070	7.8979
2075	7.63713
2080	7.36999
2085	7.12026
2090	6.86997
2095	6.64848
2100	6.43757