11.   While nature programs have always been popular with audiences, that popularity has boomed in the last five years.

n. + program >>共 1065
government 3.08%
computer 2.82%
television 2.29%
weapon 2.13%
education 2.08%
news 1.91%
software 1.70%
space 1.54%
welfare 1.53%
treatment 1.30%
nature 0.04%
nature + n. >>共 178
reserve 21.13%
preserve 9.45%
lover 6.56%
walk 5.91%
center 3.41%
conservation 2.76%
hike 2.76%
park 2.49%
documentary 1.84%
photography 1.84%
program 1.44%
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