The table below gives details of coal production in four different states for the years 2014 to 2018. Observe the table and answer the question below. ​

State	2014	2015	2016	2017	2018
A	84	86	85	82	85
B	168	164	162	163	145
C	178	180	181	182	185
D	86	79	84	76	74

Coal production (in thousands)
In which year has State C registered the highest percentage contribution to the total coal production for the year?

Correct option is D

Solution:

For 2014: 

Percentage contribution of State C  = $$\left( \frac{178}{516} \right) \times 100 \approx 34.5\%$$​

For 2015:

Percentage contribution of State C = $$\left( \frac{180}{516} \right) \times 100 \approx 35.4\%$$​​

For 2016:

Percentage contribution of State C = $$\left( \frac{181}{512} \right) \times 100 \approx 35.3\%$$​​

For 2017:

Percentage contribution of State C = $$\left( \frac{182}{503} \right) \times 100 \approx 36.2\%$$​​

For 2018:

Percentage contribution of State C = $$\left( \frac{185}{489} \right) \times 100 \approx 37.9\%$$ 

The highest percentage contribution of State C is in 2018, with approximately 37.9% of the total coal production.