*Excludes Observations that spanned multiple years

Pre 19704
19700
19710
19720
19730
19740
19752
19760
19770
19780
19790
19800
19811
19820
19830
19840
19850
19861
19871
19883
19890
19901
19916
19920
19931
19942
19957
199615
199723
19980
199949
20004
20014
20024
20030
20040
20050
20060
20071
20081
20090
20100
20110
20121
20132
20140
20153
20163
20170
20180
20193
20206
20217
20226
20231
20243
Total165