Normal @ Ratios[TimeSeries /@ {data2, data1}] 

{{{1, 17/728}, {2, 54/1367}, {3, 33/1040}, {4, 77/1998}, {5, 4/45}}}

Normal @ First @ Ratios[TimeSeries /@ {data2, data1}] 

 {{1, 17/728}, {2, 54/1367}, {3, 33/1040}, {4, 77/1998}, {5, 4/45}}

Or define a function:

ClearAll[rF]
rF = Normal @* First @* Ratios @* Map[TimeSeries] @* Reverse;

rF @ {data1, data2}

Normal@ rF @ {data1, data2}

{{1, 17/728}, {2, 54/1367}, {3, 33/1040}, {4, 77/1998}, {5, 4/45}}

Or use the property "Path":

rF[{data1, data2}]["Path"]

 {{1, 17/728}, {2, 54/1367}, {3, 33/1040}, {4, 77/1998}, {5, 4/45}}