*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19852
19860
198733
198813
19899
199010
199112
19928
199310
19940
19955
19961
19970
19980
199910
200054
200137
200216
20034
20043
20053
20062
20072
200810
20090
20106
201126
20122
20134
20142
20153
20168
20171
20180
20190
Total297