Year	Number
1985	33.94945
1986	33.43248
1987	33.39503
1988	32.04531
1989	30.75349
1990	31.77258
1991	30.56053
1992	30.68733
1993	37.04284
1994	37.41449
1995	38.97122
1996	39.56436