You have been asked to interpret some marketing metrics from research data that will assist with a referral marketing strategy. You will be presenting the results to the board of directors.

The available data indicates that out of a sample of 350 customers in 2018, 240 customers are willing to recommend products to other customers, and in 2019, out of a sample of 480 customers, 295 are willing to recommend. The survey used a binary 'yes/no' scale answering the statement: 'I am willing to recommend "xyz" products to other companies'.

Calculate and interpret the relevant customer-related marketing metrics from the available data. The interpretation needs to be sufficiently comprehensive with recommendations to present to the board of directors. The response is evaluated for 7 points.