You are considering investing in three different stocks. Being a conservative investor, you are able to obtain returns data for the three stocks for the years 2014 through to 2020. The data is summarised below:

Year	Stock A	Stock B	Stock C
2014	10%	12%	25%
2015	13%	14%	20%
2016	15%	10%	22%
2017	14%	11%	18%
2018	16%	9%	17%
2019	14%	9%	18%
2020	12%	10%	16%

Calculate the covariance between A and B, A and C, and B and C. 5 marks