Year	Percent
1950	9.47936
1955	9.00325
1960	9.54638
1965	9.54743
1970	10.57606
1975	10.73932
1980	10.7918
1985	10.5317
1990	9.40263
1995	8.59238
2000	8.57181
2005	8.823
2010	8.25251
2015	7.49151
2020	6.87767
2025	6.59534
2030	6.18869
2035	5.95309
2040	5.74197
2045	5.53387
2050	5.33315
2055	5.17698
2060	5.08053
2065	5.00698
2070	4.95762
2075	4.90977
2080	4.86845
2085	4.82886
2090	4.81412
2095	4.8032
2100	4.79503