Structural Time Series Model -- Interpolation
t	Observed	Level	Slope	Seasonal	Stand. Residuals
1	691.72	691.72	0	0	0
2	839.86	819.848159560375	28.8083062585787	20.0118404396252	0.761907318391191
3	1083.36	1037.07935741206	108.808127217997	46.2806425879429	1.25105920865598
4	1326.82	1300.33921298185	183.214892336752	26.4807870181528	0.953965116071532
5	1555.92	1546.6617067266	213.601258533007	9.25829327339531	0.387621898642
6	1385.54	1455.43962645701	66.74722066005	-69.8996264570106	-1.89111475769963
7	1704.08	1644.84082336416	125.948890656162	59.2391766358435	0.763496532816836
8	1737.16	1745.47358950615	113.720541989136	-8.31358950615171	-0.157704309256131
9	1913.56	1895.88092355245	131.444086434827	17.6790764475458	0.228566491656865
10	2487.28	2395.40022409138	309.270284291119	91.879775908622	2.29326680519597
11	2696.24	2714.79398068634	314.161339275104	-18.5539806863395	0.063075562895928
12	2982.52	2986.42972526533	293.615025703169	-3.90972526532664	-0.264967461197746
13	3165.84	3240.4231592389	274.936938548064	-74.5831592389042	-0.264874442851182
14	3580.66	3585.4485850613	307.116722749547	-4.78858506130434	0.392854545083798

Structural Time Series Model -- Extrapolation
t	Observed	Level	Seasonal
1	3945.61473942641	3857.17412366324	88.4406157631718
2	4334.40124861543	4157.14017504476	177.261073570668
3	4687.51845852781	4457.10622642629	230.412232101516
4	4627.37655893129	4757.07227780782	-129.695718876533
5	5042.374779077	5057.03832918935	-14.6635501123477
6	5158.13313003556	5357.00438057088	-198.871250535316
7	5403.43121130842	5656.97043195241	-253.539220643986
8	6032.26895658787	5956.93648333394	75.3324732539358
9	6282.56703713179	6256.90253471547	25.6645024163243
10	6596.40553528091	6556.868586097	39.5369491839134
11	6793.50460363888	6856.83463747852	-63.3300338396402
12	7180.25261657835	7156.80068886005	23.4519277182928