Table 5.

The number of publications published from the United States of America from 1990 to 2003, in absoute numbers and in percentages

Year															Tot.
	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002	2003
NOT USA	60 32.3	68 36.8	55 25.7	94 34.4	92 29.6	114 33.7	105 35	125 41.3	121 42.8	171 52.5	139 44.8	166 49.6	142 44.4	187 54.2	1639
USA	126 67.7	117 63.2	159 74.3	179 65.6	219 70.4	224 66.3	195 65	178 58.8	162 57.2	155 47.6	171 55.2	169 50.5	178 55.6	158 45.8	2390
Total	186	185	214	273	311	338	300	303	283	326	310	335	320	345	4029