*Excludes Observations that spanned multiple years

Pre 19709
19700
19710
19720
19730
19740
19751
19760
19770
19780
19790
19800
19810
19820
19831
19840
198510
19868
19875
198828
19890
199012
19915
199221
19936
19944
199548
19964
19971
19980
199958
200024
20014
20026
20034
200410
20059
20069
20077
20089
200915
20109
20115
20128
201315
20146
20153
20163
20173
20181
20191
20203
20212
20224
20231
20240
Total382