Year	Percent
1950	9.50461
1955	7.60984
1960	7.73308
1965	7.73932
1970	7.58682
1975	8.16519
1980	8.38994
1985	8.09191
1990	8.15538
1995	7.72418
2000	6.1785
2005	5.05283
2010	4.52564
2015	4.31729
2020	4.7306
2025	5.10396
2030	4.56138
2035	4.20652
2040	3.91287
2045	3.81808
2050	3.9291
2055	4.14374
2060	4.31075
2065	4.32129
2070	4.25149
2075	4.21379
2080	4.24134
2085	4.31586
2090	4.39181
2095	4.41546
2100	4.38148