SQL Write a query to find out how many years of events are in this data?

Tabel contains the following column

EVENT$\_$ID NUMBER$(38,0)$

EVENT$\_$TYPE VARCHAR$(16777216)$

SESSION$\_$ID VARCHAR$(16777216)$

SESSION$\_$SEQUENCE NUMBER$(38,0)$

TIMESTAMP VARCHAR$(16777216)$

USER$\_$ID NUMBER$(38,0)$

IP$\_$ADDRESS VARCHAR$(16777216)$

BROWSER VARCHAR$(16777216)$

TRAFFIC$\_$SOURCE VARCHAR$(16777216)$

URI VARCHAR$(16777216)$

CITY VARCHAR$(16777216)$

STATE VARCHAR$(16777216)$