Year	Percent
1950	10.98898
1955	10.79501
1960	11.13968
1965	10.47635
1970	13.61128
1975	14.98316
1980	13.52121
1985	12.53356
1990	11.07701
1995	11.01637
2000	10.54368
2005	10.63889
2010	10.26072
2015	8.70273
2020	7.77445
2025	7.09215
2030	7.83433
2035	7.30476
2040	6.69242
2045	6.1174
2050	5.68258
2055	5.4735
2060	5.39108
2065	5.29414
2070	5.08486
2075	4.78832
2080	4.57166
2085	4.47891
2090	4.48514
2095	4.49073
2100	4.42095