Year	Percent
1950	11.40441
1955	12.57269
1960	12.94293
1965	12.72045
1970	10.23595
1975	8.37052
1980	8.16936
1985	7.83284
1990	7.48675
1995	7.02558
2000	6.55687
2005	6.2339
2010	5.96131
2015	5.79052
2020	5.58221
2025	5.40997
2030	5.27794
2035	5.18982
2040	5.15144
2045	5.13369
2050	5.11773
2055	5.1037
2060	5.08336
2065	5.07046
2070	5.05752
2075	5.04564
2080	5.02271
2085	4.9936
2090	4.96244
2095	4.93391
2100	4.90875