Year	Percent
1950	13.43342
1955	12.75278
1960	15.90133
1965	15.22755
1970	14.10612
1975	14.0264
1980	12.68592
1985	9.88106
1990	11.62135
1995	10.72167
2000	10.08632
2005	10.20265
2010	9.29089
2015	8.46058
2020	7.98273
2025	7.68766
2030	7.40338
2035	7.04161
2040	6.65242
2045	6.33077
2050	6.11454
2055	5.97558
2060	5.84946
2065	5.69432
2070	5.51617
2075	5.36448
2080	5.24792
2085	5.18999
2090	5.14763
2095	5.09485
2100	5.02425