Input type="range" ; Step value change by condition

Question

hello...

 

How to change input type="range" =>step value based on condition ? 

 

like i want <!-- :Difference: 200 250 350 450 all the way to 1150, 1200 -->

 

First value is 200..then its increase by 50...after that its increase by 100...(its look like : 250..350...1150...)

 

My input range control is : <input id="years" type="range" value="200" min="200" max="1200" />