The two pie charts illustrate the proportion of materials that used for the production of forks between 1900 and 2000. it is immediately obvious that there are some quite significantly different between the two charts.
Overall, the persentage of wood was the largest in 1900 with 47.0% of total, but it plummeted to 17% by 2000. Followed by iron, it was the second widely production that experiencing a decline from 30% to 18% in total. Siliver making it a thrid common that slightly decreased from 17% to 8%. Gold was the least common shared with 6% in 1900 but it insignificantly increased to 10% in 2000.
According to the chart, in 2000 manufacturing landscape introduced steel and cooper which was not in the earlier period. Steel took 30% of the chart which is repersent one third of the materials, whereas cooper was accounting for 17% of the total in 2000.
