Sectors;Period;Total
Total no. centres in the directory;1997;336
Total no. centres in the directory;1995;401
Total no. centres in the directory;1993;365
Total no. centres in the directory;1992;344
Total no. centres in the directory;1991;333
Total no. centres in the directory;1990;359
Centres that answered. Perform R+D.  Total;1997;183
Centres that answered. Perform R+D.  Total;1995;216
Centres that answered. Perform R+D.  Total;1993;179
Centres that answered. Perform R+D.  Total;1992;204
Centres that answered. Perform R+D.  Total;1991;200
Centres that answered. Perform R+D.  Total;1990;189
Centres that answered. Perform R+D. %;1997;54
Centres that answered. Perform R+D. %;1995;54
Centres that answered. Perform R+D. %;1993;49
Centres that answered. Perform R+D. %;1992;59
Centres that answered. Perform R+D. %;1991;60
Centres that answered. Perform R+D. %;1990;53
Centres that answered. Do not perform R+D. Total;1997;126
Centres that answered. Do not perform R+D. Total;1995;72
Centres that answered. Do not perform R+D. Total;1993;99
Centres that answered. Do not perform R+D. Total;1992;78
Centres that answered. Do not perform R+D. Total;1991;78
Centres that answered. Do not perform R+D. Total;1990;112
Centres that answered. Do not perform R+D. %;1997;38
Centres that answered. Do not perform R+D. %;1995;18
Centres that answered. Do not perform R+D. %;1993;27
Centres that answered. Do not perform R+D. %;1992;23
Centres that answered. Do not perform R+D. %;1991;23
Centres that answered. Do not perform R+D. %;1990;31
Centres that did not answer. Total;1997;24
Centres that did not answer. Total;1995;59
Centres that did not answer. Total;1993;87
Centres that did not answer. Total;1992;62
Centres that did not answer. Total;1991;55
Centres that did not answer. Total;1990;58
Centres that did not answer. %;1997;7
Centres that did not answer. %;1995;15
Centres that did not answer. %;1993;24
Centres that did not answer. %;1992;18
Centres that did not answer. %;1991;17
Centres that did not answer. %;1990;16
Other events. Total;1997;3
Other events. Total;1995;54
Other events. Total;1993;..
Other events. Total;1992;..
Other events. Total;1991;..
Other events. Total;1990;..
Other events. %;1997;1
Other events. %;1995;13
Other events. %;1993;..
Other events. %;1992;..
Other events. %;1991;..
Other events. %;1990;..