Year	Percent
1950	14.93432
1955	13.49683
1960	10.15463
1965	10.23653
1970	12.30351
1975	13.24118
1980	13.2247
1985	12.51512
1990	12.15113
1995	14.20439
2000	14.77755
2005	12.3594
2010	9.15978
2015	7.421
2020	7.73817
2025	8.55185
2030	8.09245
2035	6.93894
2040	5.76485
2045	5.16966
2050	5.18359
2055	5.38501
2060	5.3485
2065	5.01383
2070	4.63231
2075	4.4429
2080	4.50818
2085	4.67473
2090	4.75993
2095	4.68158
2100	4.52646