Year	Percent
1950	12.37811
1955	11.66246
1960	10.36089
1965	13.36477
1970	13.04394
1975	12.55151
1980	13.286
1985	11.66561
1990	10.18686
1995	10.41859
2000	11.85077
2005	9.78375
2010	8.82454
2015	8.20272
2020	7.47087
2025	7.41284
2030	6.97461
2035	6.53041
2040	6.24305
2045	5.98468
2050	5.76457
2055	5.59587
2060	5.44601
2065	5.30228
2070	5.16292
2075	5.05389
2080	4.97627
2085	4.92236
2090	4.87438
2095	4.83194
2100	4.78449