Year	Percent
1950	13.40573
1955	13.34841
1960	15.20461
1965	16.98615
1970	19.09724
1975	17.39237
1980	15.65566
1985	14.58367
1990	12.57517
1995	11.96836
2000	11.33634
2005	9.77601
2010	7.77597
2015	6.37815
2020	6.0842
2025	5.82425
2030	5.50327
2035	5.18239
2040	4.8335
2045	4.51954
2050	4.34561
2055	4.29159
2060	4.27515
2065	4.23874
2070	4.17836
2075	4.12685
2080	4.12288
2085	4.17372
2090	4.25048
2095	4.31877
2100	4.35057