The diagram below shows the percentage of share of total world production of wheat by Asia Europe and other part of the world from the years 1840 to 2000 Summarise the information by selecting and reporting the main features and make comparisons

Thｅ ｂａｒ ｃｈａｒｔ ｉｌｌｕｓｔｒａｔｅｓ ｔｈｅ ｐｒｏｐｏｒｔｉｏｎ ｏｆ ｔｏｔａｌ ｗｏｒｌｄ ｐｒｏｄｕｃｔｉｏｎＡｓｉａ，Ｅａｅｒｏｐｌｅ ａｎ ｈｅ ｐｒｏｐｏｒ ｔｉｏｎ ｏｎ ｔｏ ｔａ ｌ ｗｏｒｌｄ ｐｒｄｕｃｔ２ １００ｆ １８４０，ｔｈｅ ｗｈｅａｔ ｐｒｏａｎａｄｔｉｏｎｅ ｒｅｓｔｉｔ ｔｈａ ｗｏｒｌｏｐ ｅｒａｍｅ ａ ｆｏｒ ａｌｍｏｓｔ ９０９．１ ｏｆ ｔｈｃｅｗｏｎｈａｅ ｗｏｈｅａｔ ｐｒｏｄａｕｃ ｔｉ ｎ ｉａ ｓｉｎ Ａｎａｅ ｎｏｐｅ ａｃｃａｕｎｔｅｄ ｆｏｒ ａｔｈａｓ ｔ ｈａｌｆ，ｒｅａｃｈｉｎｇ ａｔ５２％Ｓｕｂｓｅｇｕｅｎｔｌｙ，ｉｔｓ ｆｉｇｕｒｅ ｄｒｏｐｐｅｄ ｄｒａｍａｔｉｃａｌｌｙ ｔｏｏｎｅｆｉｆｔｈｉｎ １９２０，ｒｅａｃｈｉｎｇ ｉｔｓ ｌｏｗｅｓｔ ｐｏｉｎｔ ａｎｄｓｔａｂｉｌｒｓｉｎｇｅ ａｔ ｔｈｉｓ ｌｅｖｅｌ ｆｏｒ ４０ ｙｅａｒｓ，ｂｅｆｏｒｅ ｉｔ ｄｏｕｂｌｅｄ ｔｏ ４０％ｉｎ２０００．Ｏｎ ｔｈｅ ｏｔｈｅｒ ｈａｎｄ，ｔｈｅ ｓｈａｒｅ ｏｆ Ｗｈｅａｔ ｐｒｏｄｕｃｔｉｏｎ ｉｎ Ｅｕｒｏｐｅ ｉｎｃｒｅａｓｅｄ ｓｔｅａｄｉｌｙ ｆｒｏｍ ａｂｏｕｔ３．８％ｉｎ １８４０ ｔｏ ４８％ｉｎ １９２０，ａｆｔｅｒ ｗｈｉｃｈ ｉｔｆｅｌｌ ａｎｄ ｂｏｔｔｏｍｅｄ ｏｕｔ ａｔ ａｐｐｒｏｘｉｍａｔｅｌｙ ２５％ｉｎ２０００ Ｉｎ ｔｅｒｍｓ ｏｆ ｔｈｅ ｒｅｓｔ ｏｆ ｔｈｅ ｗｏｒｌｄ，ｔｈｅ ｗｈｅａｔ ｙｉｅｌｄ ｓａｗ ａ ｓｉｇｎｉｆｉｃａｎｔ ｅｓｃａｌａｔｉｏｎ ｆｒｏｍ ｎｅａｒｌｙ ９％ ｔｏ ｔｗｏ ｏｕｔ ｏｆ ｆｉｖｅ ｂｅｔｗｅｅｎ １８．４０ ａｎｄ １９６０， ｂｅｆｏｒｅ ｉｔ，ｏｎ ｔｈｅ ｃｏｎｔｒａｒｙ，ｄｅｃｌｉｎｅｄ ｂｙ ｒｏｕｇｈｌｙ５％， Ｏｖｅｒａｌｌ，ｔｈｅ ｏｖｅｒａｌｌ ｗｈｅａｔ ｏｕｔｐｕｔ ｉｎ ｏｔｈｅｒ ｃｏｕｎｔｒｉｅｓ ｓｈｏｗｅｄ ａｎ ｕｐｗａｒｄ ｔｅｎｄｅｎｃｙ，ｗｈｅｒｅａｓ Ａｓｉａ ａｎｄ Ｅｕｒｏｐｅ ｅｘｐｅｒｉｅｎｃｅｄ ａｎ ｏｐｐｏｓｉｔｅｔｒｅｎｄ ｄｕｒｉｎｇ ｔｈｅ ｗｈｏｌｅ ｐｅｒｉｏｄ，ｗｈｉｃｈ ｃｏｎｔｒｉｂｕｔｅｄ ｔｏ ｍｕｃｈ ｓｍａｌｌｅｒｇａｐｓ ａｍｏｎｇ ｔｈｅ ｔｈｒｅｅ ｉｎ．２０００，ａｌｔｈｏｕｇｈ Ａｓｉａ ｓｔｉｌｌ ｌｅｄ ｔｈｅ ｗａｙ