secular
adj.— «In Wall Street parlance, a very long period of falling or, at best, sideways-moving stock prices is termed a “secular” bear market. And there have been some doozies in relatively recent U.S. history.» —“What to do if stocks’ troubles go on…and on” by Tom Petruno Los Angeles Times (California) June 28, 2008. (source: Double-Tongued Dictionary)
Further reading
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I believe this is just OED sense 8 of secular:
“Econ. and Statistics. Of a fluctuation or trend: occurring or persisting over an unlimited period; not periodic or short-term.”