Year	Percent
1950	13.93859
1955	13.3036
1960	13.64565
1965	15.42508
1970	14.19083
1975	12.58722
1980	11.74425
1985	9.71286
1990	8.92286
1995	6.86702
2000	7.36053
2005	6.5133
2010	5.07847
2015	4.52076
2020	4.34214
2025	4.35398
2030	4.36293
2035	4.40289
2040	4.23601
2045	3.90974
2050	3.77865
2055	3.87377
2060	4.07135
2065	4.26932
2070	4.38408
2075	4.3543
2080	4.24176
2085	4.20977
2090	4.29763
2095	4.43792
2100	4.54151