The bar chart shows the revenue (in lakhs) of a company from three products-X, Y, and Z-over four years (2010 - 2013). In which year is the total revenue highest? 
| Year | Product X | Product Y | Product Z | Total Revenue |
|---|---|---|---|---|
| 2010 | 50 | 40 | 30 | 120 |
| 2011 | 60 | 50 | 40 | 150 |
| 2012 | 70 | 60 | 50 | 180 |
| 2013 | 80 | 55 | 45 | 180 |




