Year	Percent
1950	7.74681
1955	12.27806
1960	6.96429
1965	7.51389
1970	9.23084
1975	10.58328
1980	10.13536
1985	8.66256
1990	8.16813
1995	8.5334
2000	8.89433
2005	9.96709
2010	8.73668
2015	6.0144
2020	5.72736
2025	7.76341
2030	9.18005
2035	8.10125
2040	7.12037
2045	6.48662
2050	6.38744
2055	6.6132
2060	6.81907
2065	6.73987
2070	6.37586
2075	5.96937
2080	5.75214
2085	5.7235
2090	5.75649
2095	5.72422
2100	5.59357