Year	Percent
1950	18.46598
1955	16.46351
1960	18.72158
1965	17.33705
1970	12.69194
1975	12.93521
1980	12.54184
1985	13.93228
1990	14.86007
1995	11.41966
2000	9.99669
2005	8.73218
2010	9.02826
2015	9.10167
2020	8.59083
2025	7.59783
2030	6.63189
2035	6.09579
2040	5.94273
2045	5.83403
2050	5.5528
2055	5.13598
2060	4.74118
2065	4.5196
2070	4.48849
2075	4.51138
2080	4.47575
2085	4.35408
2090	4.20572
2095	4.11483
2100	4.1261