Top 3 crops by yield in the year 2006 are:

Caster Seed's yield in the year 2006 = $$\dfrac{135}{106}$$ = 1.273

Groundnut's yield in the year 2006 = $$\dfrac{491}{317}$$ = 1.55

Maize's yield in the year 2006 = $$\dfrac{1102}{1004}$$ = 1.097

Sunflower's yield in the year 2006 = $$\dfrac{880}{472}$$ = 1.864

Rice's yield in the year 2006 = $$\dfrac{153}{107}$$ = 1.429

Bazra's yield in the year 2006 = $$\dfrac{2172}{4992}$$ =0.435

Top 3 yields in 2006: Sunflower,Groundnut,Rice