Year	Percent
1950	14.31291
1955	12.93327
1960	16.09969
1965	16.63808
1970	15.48203
1975	15.13298
1980	15.52388
1985	15.62833
1990	15.60299
1995	14.64928
2000	13.35749
2005	12.07472
2010	10.8537
2015	10.14896
2020	9.27689
2025	8.49442
2030	7.72926
2035	7.09043
2040	6.56035
2045	6.14319
2050	5.78991
2055	5.48118
2060	5.21893
2065	4.99065
2070	4.82209
2075	4.6961
2080	4.60241
2085	4.5405
2090	4.48876
2095	4.44943
2100	4.42074