How has primary secondary and tertiary sectors changed over the years?

Over the years the primary, secondary and tertiary have changed in the way that they are used. For example in the 1900 the primary sector was used more because people produced their own Explain_he_areas_of_growth_or_decline_in_the_primary_secondary_and_tertiary_classificationsand had their own animals for meat, but as the years have gone on people started to trade the food that they produced and the animals they owned for other products. In 1993 the percentage of people working in the tertiary sector was 73.8%, and then this figure started to increase as the years past. In 1998 it was 75.0%, in 2000 it was 76.5%, in 2003 it was 78.7% and in 2005 it was 81.6%, but as the tertiary sector was increasing the primary sector was decreasing. In 1993 it was 2.2%, in 1998 it was 2.0%, in 2000 it was 1.7%, and in 2003 it was 1.4. The figure in 2003 did not change