MATLAB: How to get a first value of each index from the other column

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I have this kind of data. First column and seconds column refer to an index and x value relatively.
data = [1 200; 1 201; 1 202; 1 201; 2 301; 2 313; 2 311; 3 401; 3 452; 3 433; 3 405; 4 504; 4 303; 4 604; 4 703; 5 600; 5 700; 5 606; 5 703; 5 905; 5 444;];
I want to have first value of 2nd colum of each index.
I'd like to have this kind of data that has half length (or tird whatever ratio) of index.
data = [1 200; 2 301;3 401;4 604;5 600;];
If anyone can help, it would be greatly appreciated.
Thank you!

Best Answer

Use unique to get the list of first indices, the use either find or min in a loop.
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