Year	Percent
1950	13.53734
1955	13.62118
1960	13.72676
1965	14.57755
1970	15.01315
1975	14.75119
1980	13.98475
1985	15.02726
1990	15.3897
1995	13.41107
2000	12.67567
2005	10.63168
2010	7.91636
2015	7.19747
2020	7.48517
2025	7.14733
2030	6.39487
2035	5.55877
2040	5.04953
2045	4.91413
2050	4.95081
2055	4.91692
2060	4.71686
2065	4.43877
2070	4.2312
2075	4.18071
2080	4.25105
2085	4.34117
2090	4.36126
2095	4.30845
2100	4.24965