What was the relationship between the shona people and the groups along the swahili coast?

Shona people has the largest population of indigenous people in zimbabwe that is composed of more than 9 million people. They have products such textiles, golds, and copper. Swahili groups situated near Swahili coast shows interest with the Shona's people goods that is why the Swahili people chose to trade with Shona people.  

1920 census

the census was scheduled for january the 1st, as the government believed that more farmers would be in their homes by that time instead of april. the census did not ask about unemployment, the number of children, and how long was a couple married were not taken into consideration. individuals were considered as residents of the places they normally slept, not the places were they worked at or visited.

2010 census

the census was scheduled for april 1st, 2010. it was the shortest census in history: it only contained 10 questions related to name, age, gender, ethnicity, relationship, and whether the citizen owned a home or rented one. the government launched a website in order to provide the citizens with information regarding the census. there were also "teach census weeks" in schools nationwide.