Year	Percent
1950	17.73283
1955	19.42478
1960	19.38786
1965	19.18692
1970	19.30699
1975	18.91699
1980	18.7937
1985	18.18406
1990	17.30553
1995	16.59743
2000	15.38088
2005	13.96282
2010	12.19981
2015	10.65396
2020	9.95724
2025	9.27213
2030	8.55177
2035	7.82603
2040	7.18878
2045	6.67231
2050	6.25533
2055	5.92908
2060	5.65027
2065	5.41803
2070	5.19825
2075	5.02927
2080	4.90101
2085	4.81359
2090	4.74857
2095	4.69721
2100	4.64646