Year	Percent
1950	8.53434
1955	7.25885
1960	8.05561
1965	9.25678
1970	9.81773
1975	10.29945
1980	9.88119
1985	8.7076
1990	8.31468
1995	7.86238
2000	7.77613
2005	7.20695
2010	7.5226
2015	6.63118
2020	6.26202
2025	6.59151
2030	6.25168
2035	5.99577
2040	5.81187
2045	5.59158
2050	5.41748
2055	5.33917
2060	5.30318
2065	5.23747
2070	5.13443
2075	5.03849
2080	4.96191
2085	4.91805
2090	4.89911
2095	4.87582
2100	4.83944