Income, payments, coverage rate	Period	Total
Income	1997	23,683
Income	1996	11,221
Income	1995	10,002
Income	1994	12,474
Income	1993	114,100
Income	1992	81,004
Income	1991	66,597
Income	1990	40,785
Income	1989	34,194
Income	1988	21,231
Income	1987	20,419
Income	1986	24,994
Income	1985	23,378
Income	1984	20,781
Income	1983	18,265
Income	1982	15,707
Income	1981	16,698
Payments	1997	157,221
Payments	1996	133,878
Payments	1995	138,439
Payments	1994	128,103
Payments	1993	245,600
Payments	1992	324,673
Payments	1991	236,537
Payments	1990	221,854
Payments	1989	190,446
Payments	1988	160,745
Payments	1987	113,128
Payments	1986	103,816
Payments	1985	93,914
Payments	1984	84,742
Payments	1983	88,338
Payments	1982	78,984
Payments	1981	52,382
Balance	1997	-133,538
Balance	1996	-122,657
Balance	1995	-128,437
Balance	1994	-115,629
Balance	1993	-131,500
Balance	1992	-243,669
Balance	1991	-169,940
Balance	1990	-181,069
Balance	1989	-156,252
Balance	1988	-139,514
Balance	1987	-92,709
Balance	1986	-78,822
Balance	1985	-70,436
Balance	1984	-63,961
Balance	1983	-70,073
Balance	1982	-63,277
Balance	1981	-35,684
Coverage rate	1997	0.15
Coverage rate	1996	0.08
Coverage rate	1995	0.07
Coverage rate	1994	0.10
Coverage rate	1993	0.46
Coverage rate	1992	0.25
Coverage rate	1991	0.28
Coverage rate	1990	0.18
Coverage rate	1989	0.18
Coverage rate	1988	0.13
Coverage rate	1987	0.18
Coverage rate	1986	0.24
Coverage rate	1985	0.25
Coverage rate	1984	0.25
Coverage rate	1983	0.21
Coverage rate	1982	0.20
Coverage rate	1981	0.32
Volume of transactions	1997	180,904
Volume of transactions	1996	145,099
Volume of transactions	1995	148,441
Volume of transactions	1994	140,577
Volume of transactions	1993	359,700
Volume of transactions	1992	405,677
Volume of transactions	1991	303,134
Volume of transactions	1990	262,639
Volume of transactions	1989	224,640
Volume of transactions	1988	181,976
Volume of transactions	1987	133,547
Volume of transactions	1986	128,810
Volume of transactions	1985	117,192
Volume of transactions	1984	105,523
Volume of transactions	1983	106,603
Volume of transactions	1982	94,691
Volume of transactions	1981	69,080
Income / expenditure R+D	1997	0.04
Income / expenditure R+D	1996	0.02
Income / expenditure R+D	1995	0.02
Income / expenditure R+D	1994	0.02
Income / expenditure R+D	1993	0.20
Income / expenditure R+D	1992	0.15
Income / expenditure R+D	1991	0.14
Income / expenditure R+D	1990	0.10
Income / expenditure R+D	1989	0.10
Income / expenditure R+D	1988	0.07
Income / expenditure R+D	1987	0.09
Income / expenditure R+D	1986	0.13
Income / expenditure R+D	1985	0.15
Income / expenditure R+D	1984	0.16
Income / expenditure R+D	1983	0.17
Income / expenditure R+D	1982	0.16
Income / expenditure R+D	1981	0.23
Payments / expenditure R+D	1997	0.23
Payments / expenditure R+D	1996	0.21
Payments / expenditure R+D	1995	0.23
Payments / expenditure R+D	1994	0.23
Payments / expenditure R+D	1993	0.44
Payments / expenditure R+D	1992	0.60
Payments / expenditure R+D	1991	0.49
Payments / expenditure R+D	1990	0.52
Payments / expenditure R+D	1989	0.56
Payments / expenditure R+D	1988	0.56
Payments / expenditure R+D	1987	0.49
Payments / expenditure R+D	1986	0.53
Payments / expenditure R+D	1985	0.60
Payments / expenditure R+D	1984	0.67
Payments / expenditure R+D	1983	0.82
Payments / expenditure R+D	1982	0.82
Payments / expenditure R+D	1981	0.72