look here
https://bitcoinwisdom.com/bitcoin/difficultyDifficulty History
Date Difficulty Change Hash Rate
Feb 18 2017 440,779,902,287 4.41% 3,155,225,442 GH/s
Feb 04 2017 422,170,566,884 7.43% 3,022,014,630 GH/s
Jan 22 2017 392,963,262,344 16.64% 2,812,940,600 GH/s
Jan 10 2017 336,899,932,796 6.05% 2,411,623,656 GH/s
Dec 28 2016 317,688,400,354 2.43% 2,274,102,150 GH/s
Dec 15 2016 310,153,855,703 8.16% 2,220,167,778 GH/s
Dec 02 2016 286,765,766,821 1.76% 2,052,749,317 GH/s
Nov 18 2016 281,800,917,193 10.68% 2,017,209,539 GH/s
Nov 05 2016 254,620,187,304 0.40% 1,822,642,296 GH/s
Oct 22 2016 253,618,246,641 -1.90% 1,815,470,125 GH/s
Oct 08 2016 258,522,748,405 7.17% 1,850,577,916 GH/s
Sep 25 2016 241,227,200,230 6.82% 1,726,771,560 GH/s
Sep 12 2016 225,832,872,179 2.30% 1,616,574,667 GH/s
Aug 29 2016 220,755,908,330 1.56% 1,580,232,344 GH/s
Aug 15 2016 217,375,482,757 7.67% 1,556,034,316 GH/s
Aug 02 2016 201,893,210,853 -5.43% 1,445,207,896 GH/s
Jul 18 2016 213,492,501,108 0.04% 1,528,238,850 GH/s
Jul 04 2016 213,398,925,331 1.88% 1,527,569,009 GH/s
Jun 21 2016 209,453,158,595 6.83% 1,499,324,110 GH/s
Jun 08 2016 196,061,423,940 -1.63% 1,403,462,340 GH/s
May 24 2016 199,312,067,531 2.60% 1,426,731,353 GH/s
May 11 2016 194,254,820,283 8.73% 1,390,530,167 GH/s
Apr 28 2016 178,659,257,773 -0.01% 1,278,892,782 GH/s
Apr 14 2016 178,678,307,672 7.09% 1,279,029,147 GH/s
Apr 01 2016 166,851,513,283 0.82% 1,194,369,655 GH/s
Mar 18 2016 165,496,835,118 4.46% 1,184,672,491 GH/s
Mar 04 2016 158,427,203,767 -3.10% 1,134,066,098 GH/s
Feb 19 2016 163,491,654,909 13.44% 1,170,318,852 GH/s
Feb 07 2016 144,116,447,847 20.06% 1,031,625,717 GH/s 120 to 163 is a 36%
Jan 26 2016 120,033,340,651 5.89% 859,232,121 GH/s jump in ¾ of a month
Jan 13 2016 113,354,299,801 9.12% 811,421,684 GH/s
Dec 31 2015 103,880,340,815 11.16% 743,604,444 GH/s
Dec 18 2015 93,448,670,796 18.14% 668,931,642 GH/s
Dec 06 2015 79,102,380,900 8.77% 566,236,898 GH/s
Nov 24 2015 72,722,780,643 10.44% 520,569,941 GH/s
Nov 11 2015 65,848,255,180 5.77% 471,360,171 GH/s
Oct 29 2015 62,253,982,450 2.25% 445,631,364 GH/s
Oct 15 2015 60,883,825,480 0.12% 435,823,399 GH/s
Oct 01 2015 60,813,224,039 2.49% 435,318,014 GH/s
Sep 17 2015 59,335,351,234 4.17% 424,738,988 GH/s
Sep 04 2015 56,957,648,455 4.98% 407,718,729 GH/s
Aug 22 2015 54,256,630,328 2.95% 388,384,088 GH/s
Aug 08 2015 52,699,842,409 0.81% 377,240,166 GH/s
Jul 25 2015 52,278,304,846 2.35% 374,222,683 GH/s
Jul 11 2015 51,076,366,303 3.39% 365,618,871 GH/s
Jun 28 2015 49,402,014,931 -0.58% 353,633,397 GH/s
Jun 14 2015 49,692,386,355 4.42% 355,711,957 GH/s
May 31 2015 47,589,591,154 -2.50% 340,659,563 GH/s
May 17 2015 48,807,487,245 2.44% 349,377,603 GH/s5 ½ months we went from 48 to 62 that is a 29% jump
so 29% in 165 days was slower growth
and 36% in 21 days was pretty fast growth.
difficulty can go from 440,000,000,000 to 4,440,000,000,000 and then 44,400,000,000,000
and then more.
My guess is we are headed for flatness and slower diff growth from this april to this sept