"Year"	"Number of Cases"
"2001"	"1"
"2005"	"1"
"2006"	"2"
"2009"	"1"
"2012"	"1"
"2015"	"2"
"2016"	"1"
"2017"	"1"
"2018"	"1"
"2021"	"2"