Year	Percent
1950	8.64611
1955	11.34139
1960	12.48458
1965	12.22944
1970	10.5414
1975	9.52457
1980	9.20232
1985	9.50444
1990	9.32277
1995	8.30326
2000	6.69383
2005	6.24186
2010	7.26425
2015	7.58095
2020	6.97086
2025	6.33999
2030	5.94484
2035	5.90886
2040	6.091
2045	6.21175
2050	6.06435
2055	5.75691
2060	5.51668
2065	5.45387
2070	5.50729
2075	5.54265
2080	5.46648
2085	5.29201
2090	5.12822
2095	5.05433
2100	5.06283