下面是某中学高中生20世纪90年代和2005年购买英语资料的对比表，请描述表格内容
tapesReference booksCD/DVDInternet年人均投入20世纪90年代初33%67%0%0%￥602005年15%47%28%10%￥2101 要求:解释发生的原因
2字数:100左右
参考词汇:对比parison;购买purchase;支出expenditure
Possible version:
The diagram shows us the parison of English materials purchase made by the senior students in our school in the early 1990s and in 2005 In 2005 there were more new choices for students， like Internet and CD/DVD While in the early 1990s there were only tapes and reference books At the same time， the average expenditure on English materials has increased from 60 yuan in the early 1990s to 210 yuan in 2005 From these， we learn that there are more choices of materials on English learning and that students spend more money on them
Some reasons can explain this First， many students realize the importance of learning English English is widely used all over the world Second， since entered WTO， learning English has bee more popular Third，as science and technology have been developing so fast / with the development of science and technology， these latest English learning facilities have already been proved far more useful and effective than traditional books