Sectors	Period	Total
Total no. PNPIs in the directory	1997	399
Total no. PNPIs in the directory	1995	571
Total no. PNPIs in the directory	1993	174
Total no. PNPIs in the directory	1992	180
Total no. PNPIs in the directory	1991	191
Total no. PNPIs in the directory	1990	218
PNPIs that answered. Perform R+D.  Total	1997	59
PNPIs that answered. Perform R+D.  Total	1995	61
PNPIs that answered. Perform R+D.  Total	1993	65
PNPIs that answered. Perform R+D.  Total	1992	72
PNPIs that answered. Perform R+D.  Total	1991	80
PNPIs that answered. Perform R+D.  Total	1990	80
PNPIs that answered. Perform R+D. %	1997	15
PNPIs that answered. Perform R+D. %	1995	11
PNPIs that answered. Perform R+D. %	1993	37
PNPIs that answered. Perform R+D. %	1992	40
PNPIs that answered. Perform R+D. %	1991	42
PNPIs that answered. Perform R+D. %	1990	37
PNPIs that answered. Do not perform R+D. Total	1997	300
PNPIs that answered. Do not perform R+D. Total	1995	244
PNPIs that answered. Do not perform R+D. Total	1993	28
PNPIs that answered. Do not perform R+D. Total	1992	43
PNPIs that answered. Do not perform R+D. Total	1991	33
PNPIs that answered. Do not perform R+D. Total	1990	39
PNPIs that answered. Do not perform R+D. %	1997	75
PNPIs that answered. Do not perform R+D. %	1995	43
PNPIs that answered. Do not perform R+D. %	1993	16
PNPIs that answered. Do not perform R+D. %	1992	24
PNPIs that answered. Do not perform R+D. %	1991	17
PNPIs that answered. Do not perform R+D. %	1990	18
PNPIs that did not answer. Total	1997	22
PNPIs that did not answer. Total	1995	56
PNPIs that did not answer. Total	1993	71
PNPIs that did not answer. Total	1992	59
PNPIs that did not answer. Total	1991	60
PNPIs that did not answer. Total	1990	55
PNPIs that did not answer. %	1997	5
PNPIs that did not answer. %	1995	10
PNPIs that did not answer. %	1993	41
PNPIs that did not answer. %	1992	33
PNPIs that did not answer. %	1991	32
PNPIs that did not answer. %	1990	25
Other events. Total	1997	18
Other events. Total	1995	210
Other events. Total	1993	10
Other events. Total	1992	6
Other events. Total	1991	18
Other events. Total	1990	44
Other events. %	1997	5
Other events. %	1995	37
Other events. %	1993	6
Other events. %	1992	3
Other events. %	1991	9
Other events. %	1990	20