Line Graph in Power BI

Anonymous , Not very clear.

But the measure

Ratio = divide(sum(Table[Open Count]), sum(Table[SentCount]))

Is the one should give %. Then move Week Date(Activity Date), Month and Month week number to Date/week table and create a week Rank column

Week Rank = RANKX(all('Date'),'Date'[Week date],,ASC,Dense)

You can visualize with week of you can create measure to compare

Then measures

measures
This Week = CALCULATE([Ratio], FILTER(ALL('Date'),'Date'[Week Rank]=max('Date'[Week Rank])))
Last Week = CALCULATE[Ratio], FILTER(ALL('Date'),'Date'[Week Rank]=max('Date'[Week Rank])-1))

Power BI — Week on Week and WTD
https://medium.com/@amitchandak.1978/power-bi-wtd-questions-time-intelligence-4-5-98c30fab69d3
https://community.powerbi.com/t5/Community-Blog/Week-Is-Not-So-Weak-WTD-Last-WTD-and-This-Week-vs-Last-Week/ba-p/1051123
https://www.youtube.com/watch?v=pnAesWxYgJ8