Year	Percent
1950	9.8631
1955	10.18207
1960	8.86643
1965	10.4265
1970	11.27857
1975	11.31784
1980	11.55239
1985	10.46485
1990	10.15724
1995	9.85197
2000	9.83635
2005	10.05719
2010	10.06487
2015	9.44304
2020	8.04737
2025	7.19208
2030	6.98916
2035	7.05069
2040	6.93187
2045	6.52125
2050	5.98129
2055	5.55668
2060	5.3672
2065	5.3658
2070	5.39005
2075	5.3247
2080	5.17541
2085	5.02202
2090	4.93928
2095	4.94479
2100	4.98385