Year	Percent
1950	9.28705
1955	9.76221
1960	10.45944
1965	10.12134
1970	11.45197
1975	11.25979
1980	11.03045
1985	11.23558
1990	8.85999
1995	7.8633
2000	8.17721
2005	8.60069
2010	8.71021
2015	8.22529
2020	7.67822
2025	7.05339
2030	6.69346
2035	6.53051
2040	6.38359
2045	6.16493
2050	5.90849
2055	5.69911
2060	5.57499
2065	5.51226
2070	5.45721
2075	5.36628
2080	5.25793
2085	5.16956
2090	5.10202
2095	5.07529
2100	5.04683