Year	Percent
1950	18.8792
1955	17.59053
1960	18.51028
1965	20.56922
1970	20.83814
1975	20.21846
1980	20.04595
1985	19.46796
1990	19.78868
1995	20.12547
2000	18.27058
2005	16.2064
2010	15.5507
2015	15.10331
2020	14.43532
2025	13.50282
2030	12.52751
2035	11.6876
2040	11.02127
2045	10.4629
2050	9.92274
2055	9.36899
2060	8.81247
2065	8.31604
2070	7.87335
2075	7.49106
2080	7.13827
2085	6.80684
2090	6.50159
2095	6.21602
2100	5.97455