Year	Percent
1950	11.35361
1955	11.0498
1960	11.99511
1965	11.91826
1970	12.63035
1975	13.56455
1980	12.13229
1985	11.49829
1990	9.94632
1995	10.41621
2000	9.61294
2005	8.86836
2010	8.20132
2015	6.4443
2020	6.6884
2025	6.60699
2030	6.38469
2035	6.1305
2040	5.812
2045	5.48125
2050	5.27486
2055	5.25452
2060	5.28685
2065	5.24877
2070	5.15342
2075	5.04852
2080	4.97844
2085	4.96307
2090	4.98319
2095	4.99345
2100	4.9652