Year	Percent
1950	12.48781
1955	10.53589
1960	9.31516
1965	8.61339
1970	7.54697
1975	6.41136
1980	6.69759
1985	6.62786
1990	6.23203
1995	6.38257
2000	5.68135
2005	5.41333
2010	5.62295
2015	5.47559
2020	5.49215
2025	5.41245
2030	5.2659
2035	5.16349
2040	5.16738
2045	5.22314
2050	5.2497
2055	5.22398
2060	5.16785
2065	5.09867
2070	5.05375
2075	5.03172
2080	5.01576
2085	4.98821
2090	4.93954
2095	4.88196
2100	4.82984