1981	26900	4.43	52.27
1982	36800	4.57	54.05
1983	36000	4.56	53.89
1984	22400	4.35	55.67
1985	8500	3.93	31.88
1986	6900	3.84	51.78
1987	7950	3.90	36.31
1988	2000	3.30	42.72
1989	700	2.85	38.11
1990	2150	3.33	61.25
1991	2400	3.38	42.30
1992	650	2.81	39.17
1993	400	2.60	33.92
1994	150	2.18	46.39
1995	1400	3.15	56.23
1996	5900	3.77	64.63
1997	2750	3.44	56.80
1998	1800	3.26	56.80
1999	4550	3.66	57.31