*Excludes Observations that spanned multiple years

Pre 197022
19701
19712
19720
19730
19741
19751
19760
19772
19781
19790
19800
19810
19820
19830
19840
198510
19863
19874
19883
19895
199023
199112
199222
19932
19946
199556
199615
19975
19980
19990
20000
20011
20022
20031
20041
20050
200617
20071
20086
20093
20100
20112
20120
20132
20141
20151
20164
20170
20180
20190
20200
Total238