Year	Percent
1950	9.81677
1955	9.72638
1960	10.06692
1965	10.09724
1970	9.46611
1975	9.73506
1980	9.51029
1985	8.73944
1990	8.72514
1995	8.71334
2000	8.16188
2005	7.68078
2010	7.32308
2015	7.01607
2020	6.77355
2025	6.54097
2030	6.28551
2035	6.00918
2040	5.76133
2045	5.5686
2050	5.4171
2055	5.28128
2060	5.15601
2065	5.04128
2070	4.94108
2075	4.85974
2080	4.8062
2085	4.76335
2090	4.72147
2095	4.69161
2100	4.65543