Given a table of purchases by date, calculate the month$-$ over$-$ month percentage change in revenue. The output should include the year$-$ month date $($YYYY$-$ MM$)$ and percentage change, rounded to the $2$nd decimal point, and sorted from the beginning of the year to the end of the year. The percentage change column will be populated from the $2$nd month forward and can be calculated as $(($this month's revenue $-$ last month's revenue$)/$ last month's revenue$)*100.$

Tables Schema as Below:

purchases

columnName dataType

id INT

created$\_$at DATE

value DECIMAL$(10,2)$

purchase$\_$id INT