yr	cpi	change debt.	const.$
1990	133.4	375.8824916	375.8824916
1991	137.2	431.9898999	420.0251651
1992	141.7	399.3173038	375.9275112
1993	145.6	346.8682276	317.8037195
1994	149.4	281.2610269	251.139364
1995	153.5	281.2329907	244.4070421
1996	158.2	250.8280384	211.5073346
1997	161.5	188.3350723	155.5659358
1998	163.9	113.0469975	92.01018588
1999	168.1	130.0778927	103.2265966
2000	173.9	17.90730827	13.73683107
2001	177.6	133.2852023	100.1139977
2002	181.2	420.7725534	309.7740542
2003	184.9	554.9950971	400.4129041
2004	191.8	595.8216336	414.4035762