Year	Percent
1950	17.14261
1955	16.56712
1960	16.48598
1965	16.42364
1970	15.49506
1975	13.46776
1980	10.50346
1985	8.84266
1990	8.51124
1995	8.25489
2000	7.96145
2005	7.46305
2010	6.37228
2015	5.89963
2020	5.27778
2025	5.33693
2030	5.60939
2035	5.60011
2040	5.29554
2045	4.94813
2050	4.72958
2055	4.71775
2060	4.8578
2065	4.94835
2070	4.87508
2075	4.68191
2080	4.50629
2085	4.43688
2090	4.46721
2095	4.53316
2100	4.54368