You are working off incomplete data. The last part of your table only cover 2001 - 2004 which gives the impression that fewer hurricanes occur that decade. In reality, 2001 - 2010 was a very active decade. As you can see from NOAA table below, 18 Cat 3-5 hurricanes made landfall that decade (in the Atlantic Basin alone). More than any decades prior to that.
Also, just looking at hurricanes that made landfall is misleading. The year 2010, not a single hurricane made US landfall. However, The 2010 North Atlantic hurricane season was extremely active with 19 named storms, 12 hurricanes, and five major hurricanes. The Accumulated Cyclone Energy index that year was 190% of the 1951 - 2000 median value which put it in the “hyperactive season” category. The jet stream’s position contributed to warm and dry conditions in the eastern U.S. and acted as a barrier that kept many storms over open water. Also, because many storms formed in the extreme eastern Atlantic, they curved out to sea without threatening land due to the North Atlantic (Bermuda) High.