统计以下文本中小时频率最高的五个单词，并输出它们的出现次数和百分比。


Natural language processing (NLP) is the ability of a computer program to understand human language as it is spoken or written. The goal of NLP is to enable computers to understand, interpret, and generate human language.
The, of, to, and, is. 

出现次数从高到低分别是：6, 3, 3, 2, 2。 

百分比从高到低分别是：23.1％, 11.5％, 11.5％, 7.7％, 7.7％。