Year	Percent
1950	12.78996
1955	11.94847
1960	10.53205
1965	13.54588
1970	13.1644
1975	12.91925
1980	13.35724
1985	11.91297
1990	10.29767
1995	10.71117
2000	11.76146
2005	9.6498
2010	8.80815
2015	8.25273
2020	7.40239
2025	7.33742
2030	6.88388
2035	6.42835
2040	6.13377
2045	5.87117
2050	5.64976
2055	5.48269
2060	5.33985
2065	5.20337
2070	5.07187
2075	4.96945
2080	4.89576
2085	4.84339
2090	4.79651
2095	4.75592
2100	4.70879