Year	Percent
1950	9.97212
1955	8.30211
1960	8.46755
1965	8.42915
1970	8.19814
1975	8.83022
1980	9.08927
1985	8.82737
1990	8.90118
1995	8.45454
2000	6.79162
2005	5.50769
2010	4.89483
2015	4.72544
2020	5.18743
2025	5.60325
2030	5.01225
2035	4.62879
2040	4.31867
2045	4.23225
2050	4.37996
2055	4.64575
2060	4.85285
2065	4.87408
2070	4.78953
2075	4.72828
2080	4.7377
2085	4.81059
2090	4.89672
2095	4.93062
2100	4.89948